@inproceedings{aa567219f47148339dd38a1a9b5c9bb4,
title = "Channel Estimation for MIMO Space Time Coded OTFS under Doubly Selective Channels",
abstract = "In this paper, we present a unique word (UW)-based channel estimation approach for multiple-input multiple-output (MIMO) systems under doubly dispersive channels, which is applied to orthogonal time frequency space (OTFS) with space time coding (STC). The OTFS modulation has been recently proposed as a robust technique under time varying channels due to its property of spreading the data symbols over time and frequency. Yet another relevant aspect is the employment of multiple antennas at the transmitter and receiver. Therefore, we consider an STC MIMO system with cyclic delay diversity at the transmitter and maximum ratio combining at the receiver, where we develop a UW-based channel estimation scheme for multiple transmit antennas. We show a recently proposed frame optimization scheme for SISO is directly applicable to MIMO. In addition, we evaluate numerically the frame error rate (FER) of OTFS and OFDM with 2×2 and 4×4 MIMO, where the time varying channel is estimated using the UW-based approach. The FER results reveal that OTFS becomes more advantageous than OFDM for MIMO-STC systems with higher order modulation and code rate.",
keywords = "Channel Estimation, MIMO, OFDM, OTFS, Space Time Coding",
author = "Roberto Bomfin and Marwa Chafii and Ahmad Nimr and Gerhard Fettweis",
note = "Publisher Copyright: {\textcopyright} 2021 IEEE.; 2021 IEEE International Conference on Communications Workshops, ICC Workshops 2021 ; Conference date: 14-06-2021 Through 23-06-2021",
year = "2021",
month = jun,
doi = "10.1109/ICCWorkshops50388.2021.9473618",
language = "English (US)",
series = "2021 IEEE International Conference on Communications Workshops, ICC Workshops 2021 - Proceedings",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
booktitle = "2021 IEEE International Conference on Communications Workshops, ICC Workshops 2021 - Proceedings",
}